OUR TWO REPUBLICAN PARTIES:

A $1 trillion U.S. pension gap is dividing two longtime allies: Democrats and unions.

Left-leaning politicians from Rhode Island to California are increasingly supporting more aggressive overhauls of government pension benefits despite opposition from labor officials, traditionally one of the Democratic Party's biggest policy and electoral supporters.

The erosion of Democratic backing for conventional retirement benefits prized by teachers, firefighters and police officers is a sign of how strained government budgets are as obligations for 24 million public workers and retirees continue to mount.

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