Published: Aug 04, 2010 10:23 PM EDT
Updated: Aug 04, 2010 7:24 PM EDT

ORLANDO, Fla. (AP) - Lt. Gov. Jeff Kottkamp is endorsing Republican Marco Rubio for Senate over his boss, Gov. Charlie

Kottkamp said he and Crist, who is running as an independent and is no longer a Republican, do not share the same position on a number of issues any more.

Kottkamp said Wednesday, "I'm a lifelong Republican. I'm going to be supporting the person that I believe is going to go to
Washington and fight the Obama agenda."

Kottkamp, who is running for attorney general, also expressed disappointment that Crist switched his party registration, saying "We ran as Republicans. I was shocked."

He also said he is troubled that Crist has said as senator he would have voted for the $787 billion federal stimulus package.