It wasn't long ago that politics, like religious orientation or sexual preference, was a taboo topic in the American workplace. Political beliefs were considered a private affair — off limits to the boss.

But today employers are increasingly approaching workers to raise funds, lobby and campaign in ways they never have before, according to a Reuters analysis of FEC filings and data compiled by the Business Industry Political Action Committee.

The Washington trade group, which has offices across the street from the White House, helps firms such as Wal-Mart, Halliburton and Lockheed Martin mobilize employees on policy issues important to the companies.