The incumbent in an election is the current office-holder. For the 2012 Presidential race, the incumbent is Barack Obama.
incumbent President Lyndon Johnson
The Democratic Party candidate for the 1904 presidential election was Alton B. Parker. Parker lost to the incumbent Republican candidate, Teddy Roosevelt.
Barack Obama, incumbent President and 2012 Democratic candidate is a lawyer.Mitt Romney, the Republican candidate is not a lawyer but a financier .
The incumbent, Gerald R. Ford, ran for another term in 1976. Bob Dole was his running mate.
The two main candidates in the presidential election of 2004 were incumbent President George W. Bush, who ran as the Republican candidate, and Senator John Kerry, who ran as the Democratic candidate.
Joseph Biden , the incumbent is running for another term as VP.
Hubert Humphrey was the incumbent VP (and presidential candidate ) that Agnew replaced as VP.
Technically he is both, but it is usual to refer to him as a president or the incumbent, since referring to him as a candidate makes it sound as though he isn't already a president.
Ronald Reagan won the 1980 presidential election defeating incumbent President Jimmy Carter. Incumbent President Ronald Reagan won reelection in the 1984 presidential election defeating Walter Mondale.
Incumbent President Richard Nixon won reelection in the 1972 presidential election defeating George McGovern.
The party who does not have a 'the' candidate in office, incumbent means that that parties candidate already holds the office.
Democratic Party candidate Woodrow Wilson won the 1912 presidential election defeating Progressive Party (nicknamed the "Bull Moose Party") candidate Theodore Roosevelt and Republican Party candidate incumbent President William Taft.