 WASHINGTON AP - Congress is hitting an impasse on policing legislation, as key Senate Democrats on Tuesday opposed a Republican proposal as inadequate, leaving the parties to decide whether to take on the hard job of negotiating a compromise or walk away despite public outcry over the killings of Black Americans. The standoff threatens to turn the nationwide protests over the deaths of George Floyd, Breonna Taylor and others into another moment that galvanizes the nation but leaves lawmakers unable to act. Still, common ground is not out of reach. A new Associated Press-NORC Center for Public Affairs Research poll shows almost all Americans support some degree of criminal justice changes. This is a profound moment, it is a moral moment, said Sen. Cory Booker, D-N.J., a co-author of the Democrats proposal. The call is for us to act. Yet Congress, as it has so many times before when confronted with crisis - on gun control or immigration changes supported by broad segments of the population - is expected to stall out, for now. Lawmakers are hesitant to make moves upsetting to voters as they campaign for the fall election. And President Donald Trump, facing his own reelection, is an uneven partner with shifting positions on the types of changes he would accept from Capitol Hill. Ahead of a test vote Wednesday, Senate Majority Leader Mitch McConnell acknowledged it may fall short. If so, he vowed to try again, hoping to pass legislation before a July 4 holiday recess. The Republican bills author, Sen. Tim Scott of South Carolina, warned against a partisan, political debate that chisels away confidence in the nations institutions. This is not about them or us, said Scott, the only Black Republican in the Senate. Its about young people and others, he said, who are afraid to jog down the... 