For years now, the northern San Fernando, Santa Clarita and Antelope valleys have together comprised a unique bastion in Los Angeles County, a county where as of last year’s general election Democrats outnumbered Republicans by nearly 3 to 1.

It’s a politically different scenario in the northern slice of the county, where a deep split between parties is evident every two years, in nail-biting congressional elections and guaranteed 50-50 polling.

Amid the vast region’s sea of deep Democratic blue, the area — which includes such communities as Lancaster, Palmdale and Quartz Hill — has been a clear shade of political purple in an area where candidates of both stripes battle it out in brutal, high-profile campaigns for Congress.

But in a matter of months, that could change.

In a historic m

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