DENVER , Colorado -LRB- CNN -RRB- -- Sen. Hillary Clinton introduced herself as a `` proud supporter of Barack Obama '' at the Democratic National Convention on Tuesday as she called on her party to rally behind her former rival . Sen. Hillary Clinton , with daughter Chelsea , receives a standing ovation from the Democratic delegates . `` Whether you voted for me , or voted for Barack , the time is now to unite as a single party with a single purpose . We are on the same team , and none of us can sit on the sidelines . This is a fight for the future . And it 's a fight we must win together , '' she said . Leading up to her address , there was a lot of speculation about what she would say and whether she would make a strong enough call for unity . But she made a very strident case for Obama 's candidacy . `` No way . No how . No McCain . Barack Obama is my candidate . And he must be our president , '' Clinton said . Her speech , which was the last of the night , followed a line up of other Democrats who used their time at the podium to attack President Bush 's record and McCain 's policies . Appearing strong and energized , Clinton thanked her voters for supporting her historic campaign as a female candidate and reached out to those wary of Obama by telling them they were n't in this for her , but for her cause . That cause , she said , is the same thing that Obama and the rest of the Democratic Party are fighting for . Watch Clinton 's entire speech '' Many analysts said the speech would end speculation that Clinton has not fully embraced Obama as her party 's candidate . Clinton mentioned Obama by name more than twice as many times as she mentioned the party as a whole . Analysts weigh in on the night 's speakers '' `` I thought she was a class act , '' said political analyst David Gergen , who worked in the Clinton administration . `` I think it could well be said that nothing has so become her campaign as the way she has ended it here tonight . '' Clinton also praised Obama 's newly tapped vice presidential candidate , Sen. Joe Biden of Delaware . The former first lady called Biden `` pragmatic , tough and wise . '' Watch Clinton talk about the Obama-Biden team '' Clinton was met with a standing ovation from an enthusiastic audience . Only a few pockets of the standing-room only convention center were n't on their feet cheering for her . Observers said she had the biggest reception of the evening . As soon as the speech ended , the McCain campaign issued a statement implying that Clinton did nothing to dispel her previous criticism of Obama . `` Sen. Clinton ran her presidential campaign making clear that Barack Obama is not prepared to lead as commander-in-chief . Nowhere tonight did she alter that assessment , '' McCain spokesman Tucker Bounds said . `` Nowhere tonight did she say that Barack Obama is ready to lead . Millions of Hillary Clinton supporters and millions of Americans remain concerned about whether Barack Obama is ready to be president . '' The McCain campaign has stepped up its effort to woo disaffected Clinton supporters , running ads highlighting Clinton 's criticism of Obama during the primaries . Obama called Clinton after the speech and thanked her for her support and said she could not have done a better job . Earlier , former Virginia Gov. Mark Warner appealed across party lines in his keynote address . Obama has been campaigning hard to win Virginia , which has n't voted for a Democratic president since President Lyndon B. Johnson in 1964 . Watch Warner make his case for Obama '' According to CNN 's electoral map , the state is a toss-up going into the general election . In order for Obama to take the state 's 13 electoral votes , he would need to win over some of Virginia 's independent and Republican voters . Instead of tearing into the current administration , Warner talked about ideas -- highlighting science and technology . `` I know we 're at the Democratic convention , but if an idea works , it really does n't matter if it has an ` R ' or 'D ' next to it , '' Warner said . `` Because this election is n't about liberal versus conservative . It 's not about left versus right . It 's about the future versus the past . '' His words echoed Obama 's own keynote speech of four years ago when the then little known senator from Illinois spoke of what united rather than divided Americans . In 2004 , before John Kerry was nominated for president , Obama said to delegates : `` There is not a liberal America and a conservative America -- there is the United States of America . There is not a Black America and a White America and Latino America and Asian America -- there 's the United States of America . '' Republican strategist Alex Castellanos said Warner 's address could do for him what Obama 's address did four years ago . Watch Warner 's entire speech '' `` It 's a very powerful speech . He 's going to come out of this convention the way Barack Obama came out of the last convention -- as the rock star , as the next guy , '' he said . `` It was an important speech because if this election is about experience and strength , McCain wins . But if this election 's about the past versus the future , Republicans have a much tougher job . '' Warner 's most blunt criticism of President Bush was that he has kept the country from living up to its potential . Tuesday 's other speakers played up Obama 's message of change and tore into McCain , saying he would only bring about more of the same . Pennsylvania Sen. Robert Casey Jr. at one point feigned shock at the idea that the Republican Party was asking for four more years in the White House , promising the party of President Bush and McCain `` not four more years , but four more months . '' In response , the delegates jumped to their feet shouting , `` Four more months ! Four more months ! '' Audience members also waved signs that said `` McCain more of the same . ''