Former Congressman Dave Weldon is running for the Republican U.S. Senate nomination in Florida.
The central Florida physician announced his candidacy Friday in Orlando.
Others running for the GOP nomination are Congressman Connie Mack IV of Fort Myers and former Senator George LeMieux.
Weldon's announcement, though, didn't mention Nelson or his GOP opponents.
Instead, he attacked Democratic President Barack Obama. Weldon said many Floridians "feel President Obama has traded America's greatness for international acceptance."
He also accused Obama of turning his back on the Constitution and crushing America's economic engine.
Weldon said he would provide a conservative answer to the administration and Democratic-majority Senate.