The Potomac primary (named after the river that splits the region), also called Chesapeake Tuesday, the Beltway primary, and the Crabcake primary, is the confluence of three Democratic presidential primaries and three Republican presidential primaries that takes place after Super Tuesday.

The results on both sides were fairly unsurprising according to opinion polling, with both John McCain and Barack Obama winning by substantial margins. For Obama, however, the race had been significant as a major source of delegates in the close Democratic race, with him garnering a net gain of 50 delegates.

President Barack Obama is running unopposed.

Barack Hussein Obama II (ⁱ/bəˈrɑːk huːˈseɪn oʊˈbɑːmə/; born August 4, 1961) is the 44th and current President of the United States. He is the first African American to hold the office. In January 2005, Obama was sworn in as a U.S. Senator in the state of Illinois. He would hold this office until November 2008, when he resigned following his victory in the 2008 presidential election.

Born in Honolulu, Hawaii, Obama is a graduate of Columbia University and Harvard Law School, where he was the president of the Harvard Law Review. He was a community organizer in Chicago before earning his law degree. He worked as a civil rights attorney in Chicago and taught constitutional law at the University of Chicago Law School from 1992 to 2004. He served three terms representing the 13th District in the Illinois Senate from 1997 to 2004.

Following an unsuccessful bid against the Democratic incumbent for a seat in the United States House of Representatives in 2000, Obama ran for the United States Senate in 2004. Several events brought him to national attention during the campaign, including his victory in the March 2004 Illinois Democratic primary for the Senate election and his keynote address at the Democratic National Convention in July 2004. He won election to the U.S. Senate in Illinois in November 2004. His presidential campaign began in February 2007, and after a close campaign in the 2008 Democratic Party presidential primaries against Hillary Rodham Clinton, he won his party's nomination. In the 2008 presidential election, he defeated Republican nominee John McCain, and was inaugurated as president on January 20, 2009. Nine months later, Obama was named the 2009 Nobel Peace Prize laureate. In April 2011, he announced that he would be running for re-election in 2012.

Michael Dale "Mike" Huckabee (born August 24, 1955) is an American politician who served as the 44th Governor of Arkansas from 1996 to 2007. He was a candidate in the 2008 United States Republican presidential primaries, finishing second in delegate count and third in both popular vote and number of states won (behind both John McCain and Mitt Romney). He won the Iowa Republican caucuses. Huckabee exited the race as McCain became the presumptive Republican nominee after winning the delegate-rich winner-take-all states of Florida, California, and New York.

Huckabee is the author of several best selling books, an ordained Southern Baptistminister, musician and a public speaker. He is also an ABC Radio political commentator. He and his wife, Janet, have been married for over 37 years and have three grown children: John Mark, David, and Sarah. Janet Huckabee was an unsuccessful candidate for Arkansas Secretary of State in 2002.

Huckabee currently hosts the Fox News Channel talk show Huckabee. Starting April 2, 2012 he will host The Mike Huckabee Show from noon until 3 pm weekdays for Cumulus Media Networks.