Andy Martin is certainly a RINO but I don't think he's anywhere near as liberal as Kirk (few Republicans are). Every time I've heard Martin talk about guns, he says he's pro-2nd amendment and opposes more gun control laws. He's indifferent on gay marriage, he's pro-choice on abortion but opposes partial birth abortion (says it's infanticide). He opposed the Iraq War initially but told me that he agreed we couldn't withdraw until the country was stabilized, and he supported the surge (opposite of Kirk, who supported the war initially but then started cozying up to the cut-and-run crowd and demanding Bush begin to "redeploy" , and opposed the surge).
Make no mistake, I strongly oppose Martin's candidacy for the Senate (he has no credibility since he's a lawsuit crazy nut who has been disbarred and is a conspiracy theorist & a nasty antisemitic personality), but I doubt he's anywhere near as liberal as Kirk on the issues. Few Republicans are.
And everything I've heard Martin say about the sleazy Illinois combine is 100% correct. Like rabscuttle said, a stopped clock is right twice a day.