I love hypotheticals like this!

> If I make a donation to the Republican party, does that mean I have questionable morals?

Unquestionably.

> Roughly half the country is Republican, do they all have no morals?

(1) Only ~1/4 of the country votes Republican.

(2) Propaganda, cultural forces, and the Democrats rejection of the working class ("For every blue-collar Democrat we lose in western Pennsylvania, we will pick up two moderate Republicans in the suburbs in Philadelphia, and you can repeat that in Ohio and Illinois and Wisconsin.") encourage poor white people to vote against their class interests. They aren't lost, but pandering to their racism isn't the solution either.