WASHINGTON (Reuters) – The Biden administration will purchase 200 million more coronavirus vaccines and funnel more to states now, in a bid to deliver on the U.S. president’s promise to curb the pandemic, a senior administration official said on Tuesday. Biden, who took office last week, is in a race to contain the virus as faster-spreading variants threaten to increase the death toll across the United States, which has already been hard-hit. The administration is briefing state governors on Tuesday about its plans to increase the amount of the vaccine going to those local governments to 10 mi…