Arizona Trumper McSally Loses to Kelly

Why would this matter?

"Democrat Mark Kelly claims victory in Arizona Senate race
Democrat Mark Kelly has claimed victory against Republican Sen. Martha McSally in Arizona, which would give Democrats a badly needed pickup in the Senate if the vote returns bear out that result."

because only 4-5% of voters typically split ticket (one way for POTUS, one way for Senate) and in this instance McSally is/was sort of a Trump symbol and this would be the second Dem Senator, so the state arguably shifting.

Doesnt mean Trump cant win, just another bad sign for him