Left-Wing Democratic Party supporting groups are going to bat targeting GOP Senators over next week’s vote on the Obama/Democrat Stimulus Bill that passed the House yesterday.

Who are they targeting?

GOP Sens. Susan Collins (Maine), Olympia Snowe (Maine), Judd Gregg (N.H.), Lisa Murkowski (Alaska) and Chuck Grassley (Iowa).

An ad mixes that clip with voiceovers imploring the Republicans to cross the aisle: “Tell Sens. Collins and Snowe to support the Obama plan for jobs, not the failed policies of the past,” a voiceover intones in the ad running in Maine.

Collins and Snowe were among the five Republicans who have already supported the legislation at the committee level.

Obama won in Maine, New Hampshire and Iowa by large margins, though he lost Alaska’s electoral votes. The ads aim to pressure Murkowski, Gregg and Grassley, all of whom face re-election in 2010, to vote for the Senate version of the stimulus package.

Collins won reelection in 2008 and Snowe doesn’t face voters again until 2012.

The ads, which will cost $500,000 total, are being funded by Americans United for Change, MoveOn.org, the American Federation of State, County and Municipal Employees and the Service Employees International Union. The group of organizations estimated it would spend a combined $4 to $5 million on the entire campaign.

Will these GOP Senators hold the party discipline like the GOP House that voted unanimously yesterday against the bill?

Perhaps, because despite the ads, polling shows American voters are not that enthused over the Obama pork-laden plan.