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WASHINGTON — The exit of Don­ald Trump has brought back a more nor­mal rhythm to pol­i­tics in Wash­ing­ton, but out­side the Belt­way, deep­er forces are reshap­ing the par­ti­san landscape.Data from the NBC News poll shows that the com­po­si­tion of the two major par­ties is chang­ing, and one mas­sive shift is com­ing in employ­ment: the kinds of jobs Democ­rats and Repub­li­cans hold. There are signs across racial and eth­nic demo­graph­ic groups that Repub­li­cans are becom­ing the par­ty of blue-col­lar Amer­i­cans and the change is hap­pen­ing quickly.If the move­ment con­tin­ues it could have a large impact on the future of the …