The Communication Workers Union said 88% of its members had voted in favour of strike action.
The Culinary Workers Union backed Obama, while the leaders of the state teachers union supported Clinton.
CNN: Commentary: Road to White House full of twists and turns
The Transport Workers Union and the Association of Professional Flight Attendants were engaged in similar processes.
Talks between the Communication Workers Union (CWU) and Royal Mail have so far proven unsuccessful.
Al Silac(ph) has been a member of the Electrical Workers Union for three decades.
Communication Workers Union (CWU) claim postal workers are "struggling to complete increased delivery rounds".
But John Higgins of the Bakers, Food and Allied Workers Union said "thousands" applied for the jobs.
The Communication Workers Union (CWU) claimed that staff had not had a pay rise for two years.
Mr Henry's bill won support from shop-workers union Usdaw, the Scottish Grocers' Federation and the Co-operative Group.
The United Auto Workers union already represents employees at several Flex-N-Gate factories, and is campaigning to organize others.
The striking workers union said the action would have a major impact on deliveries in the areas concerned.
Clive Rimmer, of the Transport and General Workers Union, said he believed the closure was a "fait accompli".
BBC: News | The Company File | Golden Wonder factory shuts down
Dale Forbes, from the South African Municipal Workers Union (Samwu), said most members had heeded the strike call.
Members of Unison, Unite, the GMB and the construction workers union Ucatt are taking part in the strike.
The United Auto Workers union favors a national health care program, something that Detroit automakers have yet to endorse.
Albert Mills from the Transport and General Workers Union said strikers had to take action to protect pension arrangements.
BBC: NEWS | UK | Northern Ireland | Strike hits schools and transport
He wants to see the companies reduce their debt load and further concessions by the United Auto Workers union.
Chrysler is currently in talks with the United Auto Workers Union (UAW), over pay and benefits for its staff.
But the Communication Workers Union has said it was unreasonable to change staff's traditional working pattern on Christmas Eve.
And in fact, his branch of the United Auto Workers Union doesn't represent a single employee from the manufacturing industries.
Negotiations with the United Auto Workers union on a new national contract begin this summer at all three U.S. automakers.
Tony Woodley, Transport and General Workers Union official, said he believed an Alchemy deal could still be done within hours.
If approved, the new chairman will likely resume labor negotiations with the MTA's largest union, Transport Workers Union Local 100.
But NI Communications Workers Union spokesman Lawrence Huston said the "policy of introducing change without agreement" was damaging staff morale.
The United Auto Workers Union, whose support could prove decisive in industrial areas of the state, has not endorsed either Democrat.
When Premier Foods firm announced the closure, the Bakers, Food and Allied Workers Union said Premier should have fought for the contract.
Only when Ford's "great believer, " his wife, Clara, threatens to leave does he sign an agreement with the United Auto Workers union.
Among them: the International Brotherhood of Electrical Workers, the International Brotherhood of Boilermakers, the Utility Workers Union and the United Mine Workers.
But by no means should the Big Three, their suppliers, dealers or the United Auto Workers union breathe a sigh of relief.
Any formal representation doesn't necessarily mean the UAW (United Auto Workers union).
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