Republican presidential candidate, former Massachusetts Gov. Mitt Romney and President Barack Obama shake hands at the end of the last debate at Lynn University, Monday, Oct. 22, 2012, in Boca Raton, Fla. (AP Photo/Pablo Martinez Monsivais)
A resurgent Mitt Romney is popping up more in other Republican candidates' ads as both parties press their closing arguments in closely contested Senate races.
President Barack Obama continues to be referenced in negative ads aimed at boosting GOP candidates.
His own party's Senate hopefuls are keeping their distance from the president, turning to Bill Clinton when they feel the need for a presidential embrace.
The tactics reflect that a huge part of this year's battle for control of the Senate is being waged in conservative-leaning states such as Montana, North Dakota, Arizona and Indiana, where the candidates are hoping Romney's uptick in polls will propel their candidacies as well.
Romney has cut ads urging support for Republican Senate candidates Denny Rehberg of Montana and Jeff Flake of Arizona.