# How to make multiple lines in ToC horizontally align?

For single line, the content aligned nicely, but that's not the case when the it contains multiple lines. The alignment is odd:

So how can I make them align nicely?

Mimimum Example

\documentclass[10pt,letterpaper]{article}
\usepackage[left=1in,right=1in,top=1in,bottom=1in]{geometry}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}

\setcounter{tocdepth}{3}
\setcounter{secnumdepth}{3}
\usepackage[bookmarksopen,bookmarksdepth=3]{hyperref}
\usepackage{titlesec}
\usepackage{xcolor}

%define new colors
\definecolor{dark-red}{rgb}{0.4,0.15,0.15}
\definecolor{dark-blue}{rgb}{0.15,0.15,0.4}
\definecolor{medium-blue}{rgb}{0,0,0.5}

\hypersetup{
citecolor={dark-blue}, urlcolor={medium-blue}
}

\usepackage{tocloft}

%preven linebreak between subsection header and its content
\usepackage{titlesec}
\titleformat{\subsection}[runin]{\normalfont\bfseries}{\thesubsection.}{3pt}{}
\titleformat{\section}[runin]{\normalfont\bfseries}{\thesection.}{3pt}{}

\begin{document}

\setlength{\cftsecnumwidth}{8em} % Set numwidth of section
\setlength{\cftsubsecnumwidth}{12em} % Make subsection numwidth the same as section
\setlength{\cftsubsecindent}{\cftsecindent} % Make subsection indent the same as section

\tableofcontents
\setlength{\parindent}{0pt}
\setlength{\parskip}{1ex}

\newpage
\phantomsection
\section*{Problem 4.}
{
\numberline{Problem 4.}Let $T$ be a tree with $n > 1$ nodes. What is the maximum number of degrees one vertex $T$ can have?
What his the minimum number of degree one vertex $T$ can have? Justify both answers.
}
Something
\end{document}

-

In this specific example, you need to remove the spurious space contained in your \addcontentsline definition:

\addcontentsline{toc}{section}
{% <------ Required
\numberline{Problem 4.}Let $T$ be a tree with $n > 1$ nodes. What is the maximum number of degrees one vertex $T$ can have?
What his the minimum number of degree one vertex $T$ can have? Justify both answers.
}


Also note that hyperref complains about: "Token not allowed in a PDF string (PDFDocEncoding): removing 'math shift' on input line XXX". This is because of using math content  within the ToC entry, which eventually end up in the PDF bookmarks. To get rid of this, hyperref provides the conditional \texorpdfstring{<tex-string>}{<pdf-string>}. You would use it in the following way:

\addcontentsline{toc}{section}
{% <------ Required
\numberline{Problem 4.}Let \texorpdfstring{$T$}{T} be a tree with
\texorpdfstring{$n>1$}{n>1} nodes. What is the maximum number of degrees
one vertex \texorpdfstring{$T$}{T} can have? What his the minimum number
of degree one vertex \texorpdfstring{$T$}{T} can have? Justify both answers.
}

-
Many thanks for a very quick solution. It works nicely now. I'm surprised how detailed you are, you even noticed the little space of those mathematics symbols ;) Amazing! – Chan Sep 2 '11 at 4:41
@Chan: You're welcome! If this answered your question, consider accepting it. – Werner Sep 2 '11 at 5:46
Sorry for the late acceptance. Have been busy with school lately. Once again, thanks a lot ;) – Chan Sep 5 '11 at 19:39