Rep. Duncan Hunter R-Calif takes his "The Right Stuff Express" to South Carolina for events in Greenville, Greenwood and Batesburg-Leesville.
On the Democratic side, Sen. Hillary Clinton, D-N.Y., has a 2:00 pm ET interview on Air America which will be followed by a 3:00 pm ET interview with former Sen. John Edwards, D-N.C.
On Tuesday, Edwards also joins New Jersey State Sen. President Richard Codey (D) for a 4:00 pm ET event in the Garden State.
Before her Air America interview, Clinton delivers 10:00 am ET testimony on rail safety in Russell 253.
Sen. Barack Obama D-Ill., does another one of those campaign kick-off's this time in Philadelphia in a 3:00 pm ET event at The Electric Factory.
President Bush has no public events on his schedule.
On Capitol Hill, House Majority Leader Steny Hoyer holds his regular pen and pad briefing at 11:30 am ET.
House Speaker Nancy Pelosi's D-Calif., National Summit on America's Children gets started at 9 am ET in the Cannon House Office Building.
At 10:00 am ET, the Opportunity 08 project being co-sponsored by ABC News and the Brookings Institution holds a discussion on how climate change might affect the 2008 presidential race moderated by ABC News' Rick Klein.
Among the participants in Tuesday's discussion will be James Kvaal of the Edwards campaign and John Raidt from the McCain camp.