Last fall, GOP Rep. Mark Kirk wasn't sure that Sarah Palin had the proper qualifications to serve as vice president. But apparently he thinks she has what it takes to help him wrap up his U.S. Senate primary bid.

According to the Washington Post's Chris Cilliza, Kirk recently penned a memo to Republican bigwig Fred Malek soliciting a formal endorsement from the former Alaska governor when she swings through Chicago to appear on Oprah Winfrey's television show:

After noting that Palin will be in Chicago later this month to appear on "Oprah", Kirk writes that "the Chicago media will focus on one key issue: Does Gov[ernor] Palin oppose Congressman Mark Kirk's bid to take the Obama Senate seat for the Republicans?"

Kirk goes on to write that he is hoping for something "quick and decisive" from Palin about the race, perhaps to the effect of: "Voters in Illinois have a key opportunity to take Barack Obama's Senate seat. Congressman Kirk is the lead candidate to do that."

The Chicago media's sole focus will be on whether Palin "oppose[s] Congressman Mark Kirk's bid to take the Obama Senate seat for the Republicans?"  Really?

The only explanation for this bizarre memo is that Kirk is genuinely worried that some conservative challenger might undercut his campaign before it gets off the ground, even though no one who fits that profile has yet emerged.  But is pursuing Palin's support really worth it?  After all, she is pretty darn unpopular outside the hardcore conservative base.

Moreover, his efforts to secure her endorsement represent yet another flip-flop. Indeed, Kirk initially praised John McCain's selection of a running mate last September, only to change his mind when it became clear that she was dragging down the Republican ticket, telling the Tribune editorial board that he would have picked someone else as a running mate.  Now we've come full circle.

UPDATE (2:47 p.m.): Here's a response from Democratic Senate candidate Alexi Giannoulias:

Mark Kirk begging for Sarah Palin's endorsement makes it clear that he'll seek any endorsement, take up any policy position, and attempt any political maneuver that he thinks will get him more votes. At the very best, this is shameless political pandering. At worst, it's further proof that Mark Kirk lacks the political courage to make the tough decisions to move our nation forward.

UPDATE II (5:15 p.m.): Below is a response from Democratic Senate candidate David Hoffman:

What does Mark Kirk really believe?  Last year he correctly called the addition of Sarah Palin to the McCain ticket a mistake.  This year, when faced with a conservative primary challenge he is seeking her endorsement.  Kirk has again revealed his true colors:  No principles, no standards, whatever it takes to win.  Palin is out of touch with the values of the people of Illinois.  Today, Mark Kirk reminds us all that he is too.

Full Disclosure: The SEIU Illinois State Council, which sponsors this website, has endorsed Alexi Giannoulias in the Democratic primary for U.S. Senate.