In Shakespeare's play Julius Caesar, what quotes show Cassius being an ambitious person?

Brutus becomes disillusioned with his partner Cassius just
before the Battle of Philippi, and during their violent quarrel Brutus tells him what he
thinks of his behavior and his character. Most strikingly, Brutus
says:

Let me
tell you, Cassius, you yourself
Are much condemned to have an itching
palm,
To sell and mart your offices for gold
To undeservers. 
(IV.2)

It is significant that
right after Caesar's assassination when Brutus and Cassius are trying to win Antony's
acceptance of their new order, Cassius tells Antony:

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Your voice shall be as strong as any
man's
In the disposing of new dignities. 
(III.1)

Since this power is
of great importance to Cassius, he naturally assumes it would carry equal weight with
Antony. There is nothing Cassius cares as much about as gold. He is a real miser. Caesar
says he "has a lean and hungry look." This is because he hates to spend money even on
himself. It would seem that Cassius is ambitious for political power mainly because of
what he could gain from it in property and gold. He would have been a corrupt ruler if
he had managed to stay in Rome or if he and Brutus had won the crucial battle at
Philippi.

Casca understands Cassius very well. They grew up
together and went to school together. When Cassius invites Casca to dinner, Casca
bluntly responds:

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Ay, if I be alive, and your mind hold, and your
dinner worth the eating. 
(I.2)

He has dined at
Cassius' home before and knows what kind of meal to expect. It is amusing that after
their quarrel, when Brutus calls for a bowl of wine and says, "In this I bury all
unkindness, Cassius," Cassius says:

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My heart is thirsty for that noble
pledge.
Fill, Lucius, till the wine o'erswell the cup.
I cannot
drink too much of Brutus'
love.

Cassius is a greedy
miser. Both qualities are shown in these lines. He cannot drink too much of Brutus'
love--or of Brutus' wine. He is an opportunist. Cassius himself seems to acknowledge
this early in the play when he says:

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Well, Brutus, thou art noble; yet I
see
Thy honorable mettle may be wrought
From that it is disposed.
Therefore it is meet
That noble minds keep ever with their
likes;
For who so firm that cannot be seduced?
Caesar doth bear me
hard, but he loves Brutus.
If I were Brutus now, and he were
Cassius,
He should not humor me.  
(I.2)

What this says about
Cassius is appalling. He is exclusively concerned about his own welfare. He wants to
achieved the absolute power he was seeking. With Caesar gone, Cassius can profit
personally, although the Roman people might be no better off than
ever.