Presidential hopefuls continue to be a boon for late-night television, with Donald Trump’s visit to “The Late Show With Stephen Colbert” helping jump-start the nascent CBS program to its highest ratings since opening night. In Nielsen’s 25 markets with Local People Meters, “Late Show” earned a 1.0 overnight rating in adults 18-49 to move up to a tie with NBC’s “The Tonight Show Starring Jimmy Fallon,” which had won the last nine nights outright. ABC’s “Jimmy Kimmel Live” (0.6) ranked third. -snip- “Late Show” was up a big 42% vs. the comparable night a year ago, and Tuesday’s 3.7 is...