Bush goes on anti-Democrat attack
President Bush has warned Americans against handing over power to the Democrats in November's election.
In a speech to Republican governors, he said his rivals would leave the US "uncertain in the face of danger".
Voters will decide "between two visions of government - one that encourages enterprise and one that raises taxes".
Mr Bush's approval rating has slumped in recent weeks amid fierce attacks from Democratic contenders over the war in Iraq and the economy.
The Democrats have not yet chosen their presidential candidate - but front-runner John Kerry has capitalised on strong anti-Bush feelings among party voters.
The BBC's Katty Kay in Washington says the president would not be lashing out at potential rivals this long before the election if the White House was not worried.