A vote in support of Stem Cell research by State Senator Thomas Kean, Jr. is causing some conservative Republicans to seek out a candidate to challenge him in the June GOP primary for U.S. Senate. One GOP insider says there is a candidate who is “testing the waters.” Kean joined six Democrats on the Senate Budget and Appropriation Committee to vote to release legislation that will permit voters to decide if they want to issue $350 million in general obligation bonds to fund stem cell research. Only Senator Anthony Bucco voted against the bill in committee; three Republicans and Democrat Joseph Doria abstained, and three others were absent. Last week, Assemblyman Joseph Cryan, the Democratic State Committee Vice Chairman, criticized Kean for failing to take a stand on the issue. The full Senate is scheduled to vote on the bill tomorrow.