In it, but not of it. TPM DC

Mark Kirk's GOP Challenger Asks Him To Defend Flip-Flopping On Climate (VIDEO)

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The DSCC plans to send out the footage to reporters as an example of him attempting to bend to the tea party faction of the Republican party, and it could surface in ads targeting Kirk down the line.

We have been reporting about Kirk's shift to the right as his primary approaches in the race to fill President Obama's old Senate seat.

Kirk asked for Sarah Palin to campaign for him and is vying for endorsements from conservatives.

Just a few years ago Kirk was considered one of the most politically moderate members of the House from either party - with journalists often taking his temperature on key issues to see where American people stood.

Watch the DSCC's clip:

Late Update: The NRSC points us to an article in The Hill with a recent Tribune poll showing Kirk holds a large lead over the other GOP contenders.

The Democratic field also is split with state treasurer Alexi Giannoulias leading former Chicago Urban League President Cheryle Robinson Jackson 31-17 and a few others trailing in single digits.

"The reality is that with less than six weeks before the primary, Mark Kirk is in the driver's seat while the Democrats are in the midst of a very divisive primary that is forcing all of their candidates to the left," said the NRSC's Brian Walsh. "Good spin should at least have some basis in reality, and in this case what we're seeing from our Democrat friends is that in Illinois it clearly does not."