LaDainian Tomlinson 's third rushing touchdown breaks Shaun Alexander 's year - old record for TDs in a season as the Chargers clinch the AFC West .
LaDainian Tomlinson 's third rushing touchdown is his 29th of the year .
LaDainian Tomlinson 's third rushing touchdown , his 29th of the year , breaks Shaun Alexander 's year - old record for TDs in a season as the Chargers clinch the AFC West .