TAMPA, Fla. /NEW YORK (Reuters) - Democrats are making an all-out push to retake control of state legislatures across the United States this fall. But in the states most crucial to the party’s future, they face grim odds, a Reuters analysis of election data has found. In many states, Democrats’ only hope lies in flipping numerous districts that two years ago voted for Republicans in both the presidential and state legislative elections. The problem is especially daunting for Democrats in battleground states where congressional district lines favoring Republicans were drawn after the 2010 census, Reuters’ analysis found.