WASHINGTON — Republican leader Kevin McCarthy failed in two rounds of voting to become House speaker Tuesday, a historic defeat with no clear way out as House Republicans dug in for a long, messy start for the new Congress.Needing 218 votes in the full House, McCarthy got just 203 in both rounds — less even than Democrat Hakeem Jeffries in the GOP-controlled chamber.McCarthy had pledged a “battle on the floor” for as long as it took to overcome right-flank fellow Republicans who were refusing to …