By , (This December 14 story has been refiled to correct spelling of Perdue in paragraph two)MARIETTA, Ga. (Reuters) - Hundreds of people lined up in a cold rain on Monday to cast ballots in a pair of U.S. Senate races in Georgia that will determine control of the chamber and influence Democratic President-elect Joe Biden’s ability to enact his agenda.The Southern state, dominated by Republicans for decades, is now one of the most competitive U.S. political battlegrounds after Biden’s narrow victory in the Nov. 3 presidential election. President Donald Trump and other top Republicans have...…By , (This December 14 story has been refiled to correct spelling of Perdue in paragraph two)MARIETTA, Ga. (Reuters) - Hundreds of people lined up in a cold rain on Monday to cast ballots in a pair of U.S. Senate races in Georgia that will determine control of the chamber and influence Democratic President-elect Joe Biden’s ability to enact his agenda.The Southern state, dominated by Republicans for decades, is now one of the most competitive U.S. political battlegrounds after Biden’s narrow victory in the Nov. 3 presidential election. President Donald Trump and other top Republicans have...WW…