No, that's incorrect. Two of them, Pete Domenici and John McCain, are Republicans.
John Glenn of Ohio was one of the Democrats.
Keating was just a world-class sleaze and operator.
4 of the 5 were Democrats:
http://en.wikipedia.org/wiki/Keating_Five
The Keating Five were five United States Senators accused of corruption in 1989, igniting a major political scandal as part of the larger Savings and Loan crisis of the late 1980s and early 1990s.
The five senators:
Alan Cranston (D-CA)
Dennis DeConcini (D-AZ)
John Glenn (D-OH)
John McCain (R-AZ)
and Donald W. Riegle (D-MI)
were accused of improperly intervening in 1987 on behalf of Charles H. Keating, Jr...
Pete Domenici is not among those names.
http://en.wikipedia.org/wiki/Keating_Five