Planets, signs and the degree of the angles they are found at all have certain traits.
A trine, 120 degree angles made by two bodies or points in the zodiac, is considered an indication of positive energy available. Jupiter is thought of as a distributor of positive energy so it being involved in a trine with any other body or point in the zodiac is considered a good thing regarding the stations in life addressed by those particular signs and positions at that given time and thereafter depending on the elements involved.
What the list in the OP indicates is that there are a series of trines involving Jupiter upcoming that indicate boosts of positive energy available that could also indicate that positive events could take place on or near those times (the kind of events are indicated by the properties of the bodies/points involved). With regard to the political situation and his successes, it looks like the subject might do well by having a regular series of political wins that could work well for the mid terms as well as legislative wins during this timeframe.
At least, that's what I get out of it. 
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