WASHINGTON (AP) — House Democrats' campaign arm spent heavily last month but still has almost $55 million left in the bank for an uphill fight against the Republican majority, party officials said Thursday. The Democratic Congressional Campaign Committee's summary of fundraising through August shows it collected more than $10 million last month, taking its total for this election cycle to more than $146 million. [...] the party that holds the White House tends to lose seats at this point in a president's tenure and President Barack Obama remains deeply unpopular in many congressional districts.