How do Polish Americans vote, on the whole?
They're swing voters and are actively concentrated in the Midwestern states;
there's a whole Wiki article about it. According to said Wiki article, Poles in America vote 36.5% Dem, 33% Indy, and 26% Republican , so pretty evenly split three ways (granted, those numbers are about ten years old).
Here's how they voted in key elections:
Wilson in 1916
Harding in 1920
Coolidge in 1924
Hoover in 1928
Roosevelt in 1932, 1936, 1940, 1944
Truman in 1948
Eisenhower in 1952, 1956
Kennedy in 1960
Johnson in 1964
Humphrey in 1968
Nixon in 1972
Carter in 1976, 1980
Reagan in 1984
Bush in 1988
Clinton in 1992, 1996
Bush in 2000, 2004
Obama in 2008, 2012
Trump in 2016
Biden in 2020
So they've voted for the winner of the national election every time except twice (1980 and 1968) in the past hundred years.