(CNN) - Former Arkansas Governor Mike Huckabee said Sunday that voters' expectations might be too high for Fred Thompson's run for the Republican presidential nomination.

Weighing in on Thompson's likely candidacy on Fox News Sunday, Huckabee said "Well, let's just hope Fred decides it's just too hot this summer to even do this. Maybe he won't get in. But if he does, I think he's going to suck a lot of the oxygen out of the room when he first comes in. But I'm not sure I'd want to be in his position where the expectations are simply just sky-high for him to be able to perform."

"People are expecting him to basically come in and be the fifth head on Mount Rushmore. Whether he can live up to that - I think there's a real challenge for anybody to live up to that, including if Ronald Reagan were to come back," he told Chris Wallace. "I'm not sure he could live up to Ronald Reagan's persona and image at this stage."

(CNN) - The bad blood between Bush political adviser Karl Rove and former Democratic Senator Max Cleland hasn't eased over the years. On CNN's Late Edition with Wolf Blitzer, Cleland responded to an attack by Rove with one statement: "You know he's lying when his lips are moving."

The feud heated up during Cleland's 2002 reelection campaign, where Cleland blamed Rove for ads showing his face after Osama bin Laden and Saddam Hussein. Cleland lost the Georgia election to Republican Saxby Chambliss. In an interview last weekend, Rove accused Cleland of publicly supporting the President's bill to form the Department of Homeland Security as he worked against it. Cleland says he co-sponsored alternate legislation.

(CNN) - Speaking to Sunday church congregants in New Orleans, Democratic presidential candidate Barack Obama invoked Jesus' Sermon on the Mount days before the second anniversary of Hurricane Katrina.

"Getting ready to talk to you today, I recall what Jesus said at the end of the Sermon on the Mount," Obama said at New Orleans' First Emmanuel Baptist Church. "He said, whoever hears these sayings of mine and does them, I will liken him to a wise man who built his house on a rock."

"The rains descended, the floods came, and the winds blew and beat on that house. But it did not fall, because it was founded on the rock," he continued.

That rock, he said, was a principal of brotherhood exemplified by the church during Hurricane Katrina - but not the federal government.

"Something was wrong in America. Our foundation wasn't built on the rock," he said.

Obama blasted local, state and federal response to the storm, and touched upon ingredients necessary for the city's rebuilding, namely more employment opportunities for residents to rebuild, community-based law enforcement to tackle the city's crime epidemic, and improved health care.

President George Bush and several presidential candidates plan to visit New Orleans this week to commemorate the hurricane's anniversary.

Obama spent Saturday in Miami, where he brushed aside criticisms of running his campaign on the intangible platform of hope, calling himself a "hope monger," and proposed easing travel restriction with Cuba.

(CNN) - Democratic presidential candidate John Edwards said Sunday that Congress needs to use every tool available to push for an Iraq troop withdrawal.

"I think America said very clearly in the November 2006 election that they wanted a very different course in Iraq," Edwards said on Face the Nation. "And I think the Congress has a responsibility under that mandate."

"I think they should stand their ground," he said. "I think they should not submit a single funding bill to the president for the war that doesn't have a timetable for withdrawal. And I think they should use whatever legislative tool is available to them, including a filibuster."