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are paying tribute to those who served and those who lost their lives fighting for this country. today both president obama and his presumed republican presidential rival mitt romney will be celebrating and participating in observances. nbc's brian mooar reports. >> reporter: hundreds of thousands of bikers roared into the nation's capital on the 25th annual run of rolling thunder. a moving tribute to americans who served and sacrificed. many of these bikers are veterans. and in this election year, they could be the key to winning the white house. current and former military members ...

affect them. >> it's not enough just to make a speech about how much we value veterans. it's not enough just to remember them on memorial day. >> reporter: president obama's touting what he's done to help veterans. mitt romney promises to keep the military itself strong. he'll be marking memorial day with john mccain who lost the 2008 election, but won with veterans. the senator and war hero is paying tribute to the heroes he served with in the vietnam war. >> our motto was home with honor. and because of their leadership and their love for us, we did come home with honor. >> reporte...