OLYMPIA — Republican heavyweight Slade Gorton is back on the campaign trail two years after losing his re-election bid to the U.S. Senate. This time he's not selling himself, but something of an anathema to many of his supporters: a $7.8 billion tax increase on the November ballot. Democratic Gov. Gary Locke recruited Gorton to work with him, in part, to gain votes in rural areas for Referendum 51, a transportation package aimed largely at projects in the Puget Sound region. Gorton has had strong support practically everywhere but Seattle, which he bashed as a haven for tax-and-spend liberals. The...