A new WSJ/NBC poll shows Trump and Clinton with high disapproval ratings with all registered voters. Clinton's and Trump's disapproval ratings are higher now after increasing negative coverage in the media. Trump has a 65 percent negative rating and Clinton a 56 percent negative rating with all registered voters. Among Republican voters Cruz has a gap of 15 percentage points between him and Trump for negative ratings- Cruz at 27 percent and Trump at a high of 42 percent. In positive ratings Cruz edges out Trump by 3 percentage points 45 percent to 42 percent. Among all registered voters Cruz has nearly 50% negative rating compared to Clinton's at 56 percent, and 26% viewing him positively only 6 points behind Hillary Clinton at 32 percent. These new figures suggest Cruz would be competitive with Clinton if Clinton were to get the nomination, and Cruz were to win at the second ballot following an improving result at the primaries including California because of Trump's huge gap in negative ratings with Republican voters compared to Cruz. The 1912 election provides a glimpse of how national party conventions were determined by shifting support- Clark the Democratic candidate with the most delegates was not nominated when the Tammany Hall machine supported Clark leading to the withdrawal of support from William Jennings Bryan of the liberal wing of the Democratic party. The nomination then went to Woodrow Wilson, the next leading candidate, on the 46th ballot....