Are you suggesting that Coolidge was responsible for the crash, i.e., that small-government conservative policies lead to economic disaster?
When did it crash, and what policies did Hoover enact prior to the crash?
The fact is - the crash happened under the policies put in place by Coolidge. The crash was October 29, 1929. Hoover was in office for less than 8 months, and the budget was not even a month old when it came apart.
Was Reagan responsible for the recession of 1981/1982? Was George W Bush responsible for the recession of 2001/2002?
And you conveniently ignored the fact that Republicans lost seats under Coolidge, and continued to do so under Hoover. Reagan gained seats...