The phrase "a decisive electoral" is not correct as it is incomplete and lacks a noun to modify.
You can use it in contexts discussing elections, but it needs to be part of a complete phrase, such as "a decisive electoral victory."
Example: "The candidate's campaign strategy led to a decisive electoral outcome that surprised many."
Alternatives: "a significant election" or "a crucial electoral".
After a decisive electoral victory, there is always the temptation to be gracious to the defeated.
The war over the ACA is likely to continue until one side or the other wins a decisive electoral victory.
In 1994 the ANC won a decisive electoral victory in South Africa's first multiracial elections and came to dominate the country's political system.
In a political system in which the two parties have "maxed out" their traditional base without establishing a decisive electoral advantage, swing voters are the very stuff of political life.
In a decisive electoral reaction against the culture of graft and bribery that came to permeate every level of Kenyan society under his predecessor, Daniel arap Moi, Mr Kibaki won his mandate on an anti-corruption platform.
Thatcher led the Conservatives to a decisive electoral victory in 1979 following a series of major strikes during the previous winter (the so-called "Winter of Discontent") under the Labour Party government of James Callaghan.
Mr Zapatero hailed a "victory for democracy, law and reason", but the development has not given his party any decisive electoral boost.
Why pick Christie who could wind up losing even his home state of New Jersey in 2016 to Clinton, according to current opinion polls, when the GOP could pick up a possibly decisive electoral win in Ohio or Wisconsin?
It has a 6 percent chance of providing the decisive electoral vote, according to the model, against just a 2 percent chance for Florida.
(Ohio has about a 50-50 chance of providing the decisive Electoral College votes).
The much discussed rise in the minority share of the electorate testifies to the decisive electoral power that previously disenfranchised communities now possess.
