First, to your questions: if Charles Macmillan dreams of Noelle I doubt it is fondly; he spoke appropriately but not affectionately of his daughter, which leads me to believe his plans for her future might be easily guided (at any rate, you might contend with more resistance from her grandmother than her father); while he gave no indication that his position in his father's esteem is lacking, I certainly would not assume he will win out if placed in competition with his older brother (for instance, in matters of inheritance).
My chiefest concern is that his political ambitions may be too large to be born by the strength of his personality, and I do not at all think it would suit you to go through the trouble of campaigning by his side only to lose an election. You are a better judge of this potential than I am, however — and certainly I think you, both by virtue of your connections to Lucius et. al. and your deportment, could be a boon to his chances of success.
In short: if you desire me to, I shall give my blessing whenever he sees fit to ask for your hand.