Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Massachusetts Votes in High-Stakes US Senate Election Jim Malone 19 January 2010 Democratic candidate, Massachusetts Attorney General Martha Coakley, left, and her husband Thomas F. O'Connor, Jr. wave to supporters outside the polling station where they cast their votes in the special election to replace former Sen. Edward Kennedy, D- Photo: AP Democratic candidate, Massachusetts Attorney General Martha Coakley, left, and her husband Thomas F. O'Connor, Jr. wave to supporters outside the polling station where they cast their votes in the special election to replace former Sen. Edward Kennedy, in Medford, Massachusetts, 19 Jan 2010 Voters in the northeastern U.S. state of Massachusetts are casting ballots to choose a new U.S. senator in a tight election that could derail President Barack Obama's legislative agenda. Democrat Martha Coakley, the state's attorney general, is facing a tough challenge from Republican State Senator Scott Brown in Tuesday's special election to fill the Senate seat of the late Ted Kennedy. A Brown victory would cost Democrats their 60-seat super majority in the U.S. Senate and curtail their ability to override Republican delaying tactics on contentious legislation, such as health care reform. President Obama campaigned on behalf of Coakley in the state capital, Boston, on Sunday to rally support for the Democrat. He warned voters that his top initiatives are on the line. Recent polls show Brown tied with or leading Coakley, who had a strong advantage going into the race. Massachusetts has many more registered Democrats than Republicans, but Brown has gained support among independents frustrated with President Obama. The winner of the election will fill the remaining two years of Kennedy's term. The younger brother of the late President John F. Kennedy held the seat for 47 years until he died in August of brain cancer. The election includes a third contender, Libertarian activist Joseph Kennedy. He is not related to the late senator. Some information for this report was provided by AP. .