Rep. Hal Rogers (R) waded into the Republican Senate primary on Monday, endorsing Secretary of State Trey Grayson.

“We need him in the U.S. Senate to stop the liberal Democrats from bankrupting our country,” Rogers said in a statement.

Later in the day, the Grayson campaign lost one of its big endorsements when Focus on the Family founder James Dobson rescinded his support and threw his backing in the May 18 Republican primary to Rand Paul, an eye surgeon and son of Rep. Ron Paul (R-Texas). Dobson said he had been given misleading information about Rand Paul’s position on abortion.

“He believes that life begins at conception. He opposes earmarking and supports Israel. He identifies with the tea party movement and believes in home schooling. Sounds like my kind of man,” Dobson told the Associated Press.

Most political observers are waiting to see whether Senate Minority Leader Mitch McConnell (R-Ky.) will endorse in the primary or merely keep working for Grayson behind the scenes. The eventual GOP nominee will face either Lt. Gov. Daniel Mongiardo or Attorney General Jack Conway in November.