National Review Editor on Why Bill de Blasio Hasn't Endorsed Hillary

— -- This week we put five questions to National Review editor Rich Lowry, who joins the "This Week" roundtable Sunday.

His prediction on who will be the Republican and Democratic nominees in 2016 and why New York City Mayor Bill de Blasio hasn't endorsed Hillary Clinton's bid for White House are below.

1] Carly Fiorina, who ran Hewlett-Packard, did not claim CarlyFiorina.org and it now seems to be run by a critic of Fiorina's who is using it to attack her record. What's your reaction to this? Major or minor oversight by Fiorina?

RL: She now owns sethmeyers.org, and that's all that matters.

2] Bill de Blasio ran Hillary Clinton's first campaign for Senate but has not endorsed her run for president yet. Why do you suspect he is not fully backing her at this point? Is this a problem for Clinton?

RL: Maybe the Mayor is too distracted by mis-ruling New York City to endorse Hillary at this time? His non-endorsement is part of a campaign to pressure Hillary from the left, even though there is no viable challenger to her, and so far it has worked brilliantly.

3] It's possible a Supreme Court ruling later this year will mean legal same-sex marriage in all 50 states. Will that cause the GOP field to reassess their positioning on this issue? Should it?

RL: No and no. How marriage is defined isn't for the Supreme Court to decide, although this debate is quickly shifting to whether opposition to gay marriage will be tolerated rather than whether gay marriage will be recognized by the state.

4] Gov. Greg Abbott ordered the Texas State Guard to monitor the upcoming military training exercise Jade Helm 15. Was that the right thing to do or did it in some way legitimize conspiracy theories?

RL: It makes no sense unless perhaps Gov. Abbott is setting himself to be able to take credit for forestalling a federal invasion, since he's 100 percent guaranteed success in that objective.

5] OK, prediction time. Who do you think are going to be the Democratic and Republican nominees for president?

RL: I predict with confidence that the most ethically challenged candidate in the Democratic primary field will win, and at this point, it doesn't even look like it will be close. As for the Republicans, history says it will be Jeb Bush; the strength and volatility of the Republican field say it could be someone else. Marco Rubio has been the most impressive of the candidates so far.