WASHINGTON (Reuters) - US President Barack Obama on Saturday accused Republicans of holding American small businesses hostage to politics after Republican senators refused to back a $30 billion small-business lending package. Senate Republicans blocked the package on Thursday, dealing a fresh blow to Obamas efforts to show Americans, in the midst of a tough election year, that his administration is focused on tackling stubbornly high unemployment. With opinion polls showing eroding support for Obamas handling of the economy, Democrats fear voters will punish them for the 9.5 percent unemployment rate come November, when 435 seats in the House of Representatives and 37 of the 100 seats in the Senate will be in play in mid-term elections. Im calling on the Republican leaders in the Senate to stop holding Americas small businesses hostage to politics, and allow an up-or-down vote on this small business jobs bill, Obama said in his weekly radio and Internet address. Understand, a majority of senators support the plan. Its just that the Republican leaders in the Senate wont even allow it to come up for a vote, he said. Democratic leaders failed on Thursday to muster the 60 votes needed to advance the measure over Republican objections. Republicans are upset that Democrats shut them out during discussions to amend the package, which they say is another example of Obamas overreach in government spending. Senate majority leader Harry Reid is hopeful that a deal can still be reached that would allow the Senate to act on the bill next week. But even if the Senate passes the bill, it would be too late to get it to Obamas desk before mid-September. The House, which passed its version of the bill in June, is set to begin a six-week break on Friday. It will be unable to vote on the version passed by the Senate until then. It was at least the third time in a week that Obama had called on Republicans to back the bill. The bill provides for a $30 billion fund to invest in community banks to bolster lending. It also would provide tax credits and a limited capital gains exemption. Small businesses, which account for two-thirds of jobs created in the United States, have been hit hard by the credit crunch, making it difficult for them to expand.