MICHAEL BARONE: As Bush stays silent, his reputation steadily gains. “Perhaps Bush’s name is not mud anymore. A Washington Post/ABC poll asked respondents to rate Bush’s performance for the first time since December 2008, when only 33 percent rated it positively and 66 percent rated it negatively. What the pollster found is that today 47 percent approve and 50 percent disapprove of Bush’s performance. That approval number is precisely the same as President Obama’s in the most recent Post/ABC poll.”